|Alternative reference number||NLB/53 p96|
|Title||Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to T. Clark Esq., 96 Mildmay Road, N.|
|Date||9 May 1916|
In reply to your letter recieved this morning, Sir John Mackenzie Davidson has made no statement here with regard to the methods of centering the X-ray tube. Possibly the lecture you refer to was given at the Royal Institution.'